Report: 39 Percent of Prisoners are Unnecessarily Incarcerated Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Since 1998, at least 20 inmates have died from heat-related causes in Texas prisons. In all, more than 70 percent of Texas prisons don’t have air conditioning. ( William Perugini / Shutterstock ) Produced by Dana Roberson Produced by PRI and WNYC